15
PSD1206
- PSD1210
- SIL 3 - SIL 2 Switching Power Supply 24 Vdc
G.M. International ISM0076-7
Procedure
Supply both units under test and set the variable load resistor PR so that maximum load is applied to the connected power supplies,
verifying through A1 that load current is 10 A (6 A for PSD1206).
Note that load current A1 will be shared by the two power supplies, therefore A2 and A3 = 5 A
Step
1
Disconnect “current sharing” connection
2
Current sharing:
Connect the two power supplies as shown in the following image:
MODELS
PSD1210
PSD1206
Regulate the second’s power supply voltage (V2) by rotating its “Vout Adjust” trimmer
clockwise
, until obtaining 24.6 V
3
Verify that output current (A3) is at 75% of full load and that output current (A2) is instead at 25%
4
Re-connect “current sharing” connection and verify that voltage are approximately the same (V1
≈
V2)
5
Verify that output current (A3) is about 60% of full load and that output current (A2) is instead about 40%
6
Regulate the second’s power supply voltage (V2) by rotating its “Vout Adjust” trimmer
counter-clockwise
, until obtaining 24 V
7
Turn off both power supplies
8
+
+
-
-
-
+
=
_
CS
Sh
ar
in
g
cu
rr
en
t
+
+
-
-
-
+
=
_
CS
Sh
ar
in
g
cu
rr
en
t
Current sharing connection
PR
L/+ N/-
V1
+
V2
+
A2
+
A3
+
220 Vac
L/+ N/-
220 Vac
A1
+
D2
D1
S2
COM
S1
C2
C1
B2
B1
A2
A1
D2
D1
S2
COM
S1
C2
C1
B2
B1
A2
A1
PS UNDER TEST
SECOND PS
MODELS
PSD1210
PSD1206
